Measuring device



Feb-26, -1929.

.. A. STEINLE MEASURING DEVICE Filed April 18, 1925 Patented Feb. 26,1929.

UNITED STATES PATENT OFFICE.

ADOIII STEINLE, E111, GERMANY, ASSIGNOR TO THE FIRM CARL ZEISS, OF JENA,GERMANY.

MEASURING DEVICE.

Application filed April 18, 1925, Serial No. 24,294, and in Germany May13, 1924.

The present invention relates to a precision measuring device inwhichthe rectilinear motion of a caliper pin is converted into a circularmotion'of an index relatively to a scale. To this end the new devicecontains a screw spindle which engages in a toothed Wheel'and which isdisplaceable in the direction of its axis and rotatable about the same.With a displacement of this spindle their teeth act like those of a rackand bring about the displacement, servin for carrying out themeasurement, of the lndex relatively to the scale. A rotation of thespindle causes a fine displacement of the ini 16 dex relatively to thescale and serves for the adjustment of the device.

The annexed drawing shows in Fig. 1 in i a plan view and in Fig. 2 in aside view a dial gauge as an example of the invention,

part of the structure in each figure being removed to show interiorconstruction; Fig.

3 represents in an elevation a single part of the dial gauge In theexample shown in the drawing in 2 two extensions a and'a of the casingathere is rotatably and displaceably supported a screw spindle b whichis provided at the one end with'a caliper pin a projecting from thecasing a. The threads 6 of the spindle b act as a rack and mesh with atoothed wheel (1, whose rotations are transmitted to a rotatable index 9by means of a gear consisting of two pairs of toothed wheels 6 o and ff. The index 9 shows the amount of the motion of the caliper pin a inthe axial direction of the spindle b on a correspondingly gauged scale72-, fixed on the casing a by means. of screws 71. The spindle b has arecess 6 In the latter is supported a twopart ring 2', which isrotatable on the spindle Z) and held together by screws 2' and on whichact two springs in and k by which the caliper pin a is always pulled outof the casing a as far as possible. As a stop for the spindle 12' servesa milled head 7, which is screwed to the free end of. the spindle 7) andby means of which the spindle b may be rotated about its axis in orderto exactly adjust the index 9.

en carrying out measurements, the operation of the d1al-gauge is thesame as in the ordinary dial gauges. ,In order to adjust the index 9relatively to the scale 71. the spindle 5 should be turned by means ofthe milled head Z.

I claim:

A measuring device,

comprising a casing,

a circular scale-fixed on this casing, an index, means for supportingsaid index in the casing for rotation about the centre of this scale, atoothed wheel rotatably supported in the casing, means adapted to couplethe toothed wheel and the index, a screw s indie axially displaceableand axially rotata )le. in the casing and meshing with the toothedwheel, and a caliper pin fixed on the said screw spindle.

ADOLF STEIN LE.

